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WIP: [Swift+WASM] patches to support compiling Swift to WebAssembly #316

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WIP: [Swift+WASM] patches to support compiling Swift to WebAssembly #316

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c78bf87
WebAssembly: allow swiftcall attribute
zhuowei Apr 10, 2019
44c0dde
hack: define __EMSCRIPTEN__ when compiling to wasm
zhuowei Apr 11, 2019
bfaa96e
Switch to a WASI define
zhuowei Apr 13, 2019
8676838
WebAssembly: default to disabling exceptions on WebAssembly
zhuowei Apr 19, 2019
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4 changes: 4 additions & 0 deletions lib/Basic/Targets/WebAssembly.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -60,6 +60,10 @@ void WebAssemblyTargetInfo::fillValidCPUList(
void WebAssemblyTargetInfo::getTargetDefines(const LangOptions &Opts,
MacroBuilder &Builder) const {
defineCPUMacros(Builder, "wasm", /*Tuning=*/false);
// HACK: too lazy to backport the WASI target here
Builder.defineMacro("__wasi__");
// HACK: globally enable WASI mmap emulation
Builder.defineMacro("_WASI_EMULATED_MMAN");
if (SIMDLevel >= SIMD128)
Builder.defineMacro("__wasm_simd128__");
if (SIMDLevel >= UnimplementedSIMD128)
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10 changes: 10 additions & 0 deletions lib/Basic/Targets/WebAssembly.h
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Expand Up @@ -114,6 +114,16 @@ class LLVM_LIBRARY_VISIBILITY WebAssemblyTargetInfo : public TargetInfo {
? (IsSigned ? SignedLongLong : UnsignedLongLong)
: TargetInfo::getLeastIntTypeByWidth(BitWidth, IsSigned);
}

CallingConvCheckResult checkCallingConvention(CallingConv CC) const override {
switch (CC) {
case CC_C:
case CC_Swift:
return CCCR_OK;
default:
return CCCR_Warning;
}
}
};
class LLVM_LIBRARY_VISIBILITY WebAssembly32TargetInfo
: public WebAssemblyTargetInfo {
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3 changes: 3 additions & 0 deletions lib/Driver/ToolChains/Clang.cpp
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Expand Up @@ -448,6 +448,9 @@ static void addExceptionArgs(const ArgList &Args, types::ID InputType,
// Disable C++ EH by default on XCore and PS4.
bool CXXExceptionsEnabled =
Triple.getArch() != llvm::Triple::xcore && !Triple.isPS4CPU();
// WebAssembly: no exception handling on WASI
if (Triple.isOSBinFormatWasm())
CXXExceptionsEnabled = false;
Arg *ExceptionArg = Args.getLastArg(
options::OPT_fcxx_exceptions, options::OPT_fno_cxx_exceptions,
options::OPT_fexceptions, options::OPT_fno_exceptions);
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